WO2014176480A1 - User equipment and method for feedback of user equipment performance metrics during dynamic radio switching - Google Patents

User equipment and method for feedback of user equipment performance metrics during dynamic radio switching Download PDF

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Publication number
WO2014176480A1
WO2014176480A1 PCT/US2014/035409 US2014035409W WO2014176480A1 WO 2014176480 A1 WO2014176480 A1 WO 2014176480A1 US 2014035409 W US2014035409 W US 2014035409W WO 2014176480 A1 WO2014176480 A1 WO 2014176480A1
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WO
WIPO (PCT)
Prior art keywords
radio
performance metrics
user equipment
rat
radios
Prior art date
Application number
PCT/US2014/035409
Other languages
French (fr)
Inventor
Shilpa Talwar
Shu-Ping Yeh
Nageen Himayat
Sasha SIROTKIN
Original Assignee
Shilpa Talwar
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shilpa Talwar filed Critical Shilpa Talwar
Priority to EP14788674.1A priority Critical patent/EP2989827B1/en
Priority to CN201480017237.9A priority patent/CN105052202B/en
Publication of WO2014176480A1 publication Critical patent/WO2014176480A1/en
Priority to HK16105109.9A priority patent/HK1217145A1/en

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    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
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    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
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    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/38—Connection release triggered by timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Embodiments described herein generally relate to wireless networks. Some embodiments relate generally to user equipment feedback in a wireless network.
  • Wireless, radio access networks enable mobile devices (e.g., radiotelephones, cellular telephones, user equipment (UE)) to communicate within that network with a fixed landline infrastructure (e.g., base station, evolved node B (eNodeB)).
  • a fixed landline infrastructure e.g., base station, evolved node B (eNodeB)
  • these radio access networks can include WiFiTM, 3 rd Generation Partnership Projects (3 GPP), or BluetoothTM.
  • Typical UEs may be equipped with multiple radios. While it may be desirable to actively transmit on only one radio during an active session due to hardware limitations, energy efficiency considerations, and an overall system performance perspective, it may also be desirable to move the active session across multiple radio access technologies (RATs) in a seamless fashion.
  • RATs radio access technologies
  • FIG. 1 illustrates a plot of percent of users versus data rate in accordance with a method for feedback of user equipment performance metrics.
  • FIG. 2 illustrates an embodiment of a signal flow diagram in accordance with the method for feedback of user equipment performance metrics.
  • FIG. 3 illustrates a diagram of an embodiment of a communication system.
  • FIG. 4 illustrates a block diagram of an embodiment of user equipment.
  • Radio access technology may refer to a radio dedicated to a particular wireless technology.
  • a RAT refers to an underlying physical connection method for a radio based communication network.
  • Each radio may be configured to support a different RAT (e.g., WiFiTM, 3 GPP, BluetoothTM, 4G, Long Term Evolution (LTE)).
  • the WiFiTM may be part of an IEEE 802.1 1 standard.
  • base station may be used subsequently to refer to any fixed transceiver apparatus that may communicate using one or more particular radio technologies.
  • base station can refer to an access point, an eNodeB, or a cell site.
  • User equipment may include a plurality of radios each associated with a different RAT of multiple RATs that may select various networks or be "steered" to those networks.
  • the UE RATs can employ network selection or traffic steering between different radio access networks (RAN) such as WiFiTM, 3 GPP, BluetoothTM, 4G, LTE, or other wireless networks.
  • RAN radio access networks
  • Several solutions, based on UE-centric and network centric techniques may be used for load balancing between one network using a first radio technology (e.g., 3GPP) and second network using a second radio technology (e.g., wireless local area network (WLAN)).
  • a first radio technology e.g., 3GPP
  • WLAN wireless local area network
  • While the UE may be equipped with multiple radios, often it is still desirable to actively transmit on only one radio at a time due to hardware limitations, energy efficiency considerations, and/or an overall system performance perspective. It may also be desirable to move a given active session across one or more (RATs) in a seamless fashion such that minimal disruption to application performance may be observed by the user. For example, this may be true when moving a real-time application flow across RATs or when the channel or interference environment across RATs is changing dynamically.
  • One example of moving a real-time application flow across RATs may be when the UE is using a WiFi RAT in a WiFi network for video streaming may have the flexibility to switch to LTE to receive the remainder of the video stream using an LTE RAT.
  • the overall user application state at the time of the session transfer is still unavailable at the new radio network at the time of the transfer.
  • the state and metrics associated with the application may be useful for the radio network in allocating radio resources to better maintain application quality of service (QoS).
  • QoS application quality of service
  • MAC proportional fair media access control
  • MAC proportional fair media access control
  • Unavailability of a user's past throughput knowledge may degrade user/system performance until the system achieves steady state again.
  • the user or application performance indicator may be fed back along with the message used to trigger the switching to the new radio network.
  • the performance indicator may also be fed back in a separate message following the message used to trigger the switching. In such an embodiment, the delay between the session transfer and the feedback of the performance indicator should be reduced as much as possible.
  • the past performance indicators may be part of the metric that the scheduler uses to determine how to efficiently and fairly allocate resources to its users (e.g., UEs). Therefore, with UE feedback of such performance indicators to their new radio, the schedulers may allocate the resources based on more accurate metrics and, hence, improve the overall performance.
  • the UE may also feedback certain QoS metrics per application.
  • the network can then allocate resources to maintain a desired QoS of the application without interruption.
  • Examples of UE/application performance metrics may include: UE time-averaged throughput for a proportional- fair scheduler, video buffer size for streaming data, and/or quality of experience (QoE) metrics. These performance metrics are for purposes of illustration only. The present embodiments are not limited to any certain performance metrics.
  • the UE may feedback its past time-averaged throughput measured over a certain time window (i.e., latency time scale of the scheduler) to the new RAT.
  • a proportional- fair scheduler aims to optimize the sum log throughput of its users.
  • the sum log throughput may be a metric that balances between total data rate and UE fairness.
  • a proportional- fair scheduler may compare the metric, instantaneous rate divided by smooth- throughput, and selects the UE with the highest value of the metric to be scheduled.
  • the overall performance for proportional- fair schedulers may be improved and network- wide sum log throughput can be improved without disruption due to session transfer.
  • FIG. 1 illustrates a plot of percent of users versus data rate (Mbps). The figure shows that, with feedback of the time- averaged throughput metric, the overall fairness may be improved for two different UE-centric RAT selection rules.
  • throughput-based metrics may include measurements related to "on-time" throughput.
  • On-time throughput may capture the probability of receiving a packet before its delay deadline. This metric may be useful for a scheduler that has maximized a number of UE receiving their targeted on-time throughput.
  • the UE may also feedback their video buffer size for streaming data.
  • the buffer size may be fed back to the new radio if the UE is receiving streaming video from the base station.
  • the scheduler may have a reasonable estimate of the buffer size based on acknowledgement messages from the UE.
  • the scheduler may no longer have an estimate on the buffer size of the video. Though such information may be exchanged among the schedulers through a backbone, the UE feedback can be a more timely approach to ensure a smooth transition between RATs.
  • the UE may also feedback QoE metrics to the new RAT.
  • QoE metrics include, but are not limited to, throughput, metrics indicating acceptable video viewing quality (e.g., few dropped frames, low jittering), or metrics indicating acceptable voice over internet protocol (VoIP) conversation (e.g., short packet delay, no interruption of the conversation).
  • VoIP voice over internet protocol
  • FIG. 2 illustrates a signal flow diagram for a session transfer between RATs with UE feedback of performance metrics.
  • the UE receives an indication 201 from a first base station (BS1), associated with a first RAT, that the UE should switch its session to a second base station (BS2).
  • the UE transmits a message 203 to the second base station to trigger the switch.
  • the UE transmits its performance metrics to the second base station.
  • the UE also switches its internal radio from the RAT associated with the first base station to the RAT associated with the second base station.
  • the first base station may be a 3 GPP eNodeB and the second base station may be a WiFi access point.
  • the UE may be running a session wherein it is streaming video from the first base station.
  • the first base station instructs the UE to switch.
  • the UE determines that the second base station is the closest base station and switches its session to the second base station necessitating switching from the 3GPP RAT to the WiFi RAT.
  • the UE feedback of performance metrics during dynamic RAT switching may improve RAT switching in multi-RAT networks.
  • the UE feedback indicators/metrics of application performance to overcome the lack of information exchange between schedulers of uncoordinated RATs.
  • the performance indicators may provide useful information to the new scheduler to improve the proportional fair throughput as well as the QoE performance across applications. By aggregating the performance indicator feedback with the RAT selection decision, the information may be immediately used and performance disruption may be reduced.
  • FIG. 3 illustrates a diagram of an embodiment of a wireless communication system comprising the UE in a multiple base station
  • the illustrated communication system includes a plurality of antennas 302, 303 for communicating with the UE 301.
  • the antennas 302, 303 may be eNodeB's and/or base stations for communicating in a cellular environment.
  • the antennas 302, 303 may also be access points (AP) for communicating in a WiFi environment.
  • AP access points
  • the first antenna 302 may be an eNodeB with a base station to enable the UE 301 to communicate in a 3 GPP environment while the second antenna 303 may be an access point to enable the UE 301 to communicate in a WiFi environment.
  • the method for UE feedback of performance metrics may be used in the communication system to enable it to seamlessly switch between the 3 GPP environment to the WiFi environment.
  • the UE 301 may be executing an application that is interfacing with the 3GPP antenna 302 by streaming video.
  • the UE transmits its performance metrics to the WiFi AP 303 RAT prior to switching to the UE 301 switching from using its 3 GPP RAT to its WiFi RAT.
  • Such a switch may be accomplished using the signaling method illustrated in FIG. 2.
  • the UE 301 may thus switch from a first radio associated with a first RAT of the communication system to a second radio associated with a second RAT of the communication system.
  • Each of the RATs may be associated with a different network or communication system.
  • the first antenna 302 may be part of a first network or communication system and the second antenna 303 may be part of a second network or communication system.
  • the user performance metric may be fed back to the base station/access point (BS/AP) to help in making scheduling decisions.
  • the user performance metric can be exchanged across RATs within UEs and UEs may then feed back this information to their BS/AP through the new UE RAT. Additionally, the user performance metric can be fed back through the old RAT and exchanged between BS's/AP's over a backbone or between schedulers for different RATs if the two RATs are located in the same AP.
  • FIG. 4 is a block diagram illustrating a machine in the example form of user equipment 400, within which a set or sequence of instructions may be executed to cause the machine to perform any one of the methodologies discussed herein, according to an example embodiment.
  • the machine operates as a standalone device or may be connected (e.g., networked) to other machines.
  • the machine may operate in the capacity of either a server or a client machine in server-client network environments, or it may act as a peer machine in peer-to-peer (or distributed) network environments.
  • the machine may be a mobile
  • a communication device e.g., cellular telephone
  • a computer e.g., cellular telephone
  • PC personal computer
  • PDA personal digital assistant
  • any machine capable of executing instructions (sequential or otherwise) that specify actions to be taken by that machine.
  • machine shall also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions to perform any one or more of the methodologies discussed herein.
  • processor-based system shall be taken to include any set of one or more machines that are controlled by or operated by a processor (e.g., a computer) to individually or jointly execute instructions to perform any one or more of the methodologies discussed herein.
  • Example user equipment 400 includes at least one processor 402 (e.g., a central processing unit (CPU), a graphics processing unit (GPU) or both, processor cores, compute nodes, etc.), a main memory 404 and a static memory 406, which communicate with each other via a link 408 (e.g., bus).
  • the user equipment 400 may further include a video display unit 410 and an
  • the alphanumeric input device 412 e.g., a keypad
  • the video display unit 410 and input device 412 are incorporated into a touch screen display.
  • the user equipment 400 may additionally include a storage device 416 (e.g., a drive unit), a signal generation device 418 (e.g., a speaker), a network interface device 420, and one or more sensors (not shown).
  • the storage device 416 includes a machine-readable medium 422 on which is stored one or more sets of data structures and instructions 424 (e.g., software) embodying or utilized by any one or more of the methodologies or functions described herein.
  • the instructions 424 may also reside, completely or at least partially, within the main memory 404, static memory 406, and/or within the processor 402 during execution thereof by the user equipment 400, with the main memory 404, static memory 406, and the processor 402 also constituting machine-readable media.
  • machine-readable medium 422 is illustrated in an example embodiment to be a single medium, the term “machine-readable medium” may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) that store the one or more instructions 424.
  • the term “machine-readable medium” shall also be taken to include any tangible medium that is capable of storing, encoding or carrying instructions for execution by the machine and that cause the machine to perform any one or more of the methodologies of the present disclosure or that is capable of storing, encoding or carrying data structures utilized by or associated with such instructions.
  • the term “machine-readable medium” shall accordingly be taken to include, but not be limited to, solid-state memories, and optical and magnetic media. Specific examples of machine-readable media include nonvolatile memory, including but not limited to, by way of example,
  • semiconductor memory devices e.g., electrically programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM)
  • EPROM electrically programmable read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • flash memory devices e.g., magnetic disks such as internal hard disks and removable disks; magneto-optical disks; and CD-ROM and DVD- ROM disks.
  • the instructions 424 may further be transmitted or received over a communications network 426 using a transmission medium via the network interface device 420 utilizing any one of a number of well-known transfer protocols (e.g., HTTP).
  • Examples of communication networks include a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN) the Internet, mobile telephone networks, plain old telephone (POTS) networks, and wireless data networks (e.g., WI-FITM (IEEE 802.1 1), 3 GPP, 4G LTE/LTE-A or WiMAX networks).
  • transmission medium shall be taken to include any intangible medium that is capable of storing, encoding, or carrying instructions for execution by the machine, and includes digital or analog communications signals or other intangible medium to facilitate communication of such software.
  • the network interface device may include one or more antennas for communicating with the wireless network.

Abstract

An embodiment of a method for user equipment feedback of performance metrics during dynamic radio switching is disclosed. The method may include the UE receiving an indication to switch from a first radio associated with a first radio access technology (RAT) of a communication system to a second radio associated with a second RAT of the communication system. The UE transmits the performance metrics to the second radio and switches from a first radio of the plurality of radios to a second radio of the plurality of radios, the first radio associated with the first RAT and the second radio associated with the second RAT.

Description

USER EQUIPMENT AND METHOD FOR FEEDBACK OF USER EQUIPMENT PERFORMANCE METRICS DURING DYNAMIC RADIO
SWITCHING
RELATED APPLICATION
[0001] This application claims the benefit of priority to U.S. Patent Application Serial No. 14/107,400, filed December 16, 2013, which claims the benefit of priority to U.S. Provisional Patent Application Serial No. 61/816,662, filed April 26, 2013, each of which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] Embodiments described herein generally relate to wireless networks. Some embodiments relate generally to user equipment feedback in a wireless network.
BACKGROUND
[0003] Wireless, radio access networks (RAN) enable mobile devices (e.g., radiotelephones, cellular telephones, user equipment (UE)) to communicate within that network with a fixed landline infrastructure (e.g., base station, evolved node B (eNodeB)). For example, these radio access networks can include WiFi™, 3rd Generation Partnership Projects (3 GPP), or Bluetooth™.
[0004] Typical UEs may be equipped with multiple radios. While it may be desirable to actively transmit on only one radio during an active session due to hardware limitations, energy efficiency considerations, and an overall system performance perspective, it may also be desirable to move the active session across multiple radio access technologies (RATs) in a seamless fashion.
[0005] There are general needs for dynamic radio switching in user equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 illustrates a plot of percent of users versus data rate in accordance with a method for feedback of user equipment performance metrics.
[0007] FIG. 2 illustrates an embodiment of a signal flow diagram in accordance with the method for feedback of user equipment performance metrics.
[0008] FIG. 3 illustrates a diagram of an embodiment of a communication system.
[0009] FIG. 4 illustrates a block diagram of an embodiment of user equipment.
DETAILED DESCRIPTION
[0010] Subsequent use of the term radio access technology (RAT) may refer to a radio dedicated to a particular wireless technology. As is known by one of ordinary skill in the art, a RAT refers to an underlying physical connection method for a radio based communication network. Each radio may be configured to support a different RAT (e.g., WiFi™, 3 GPP, Bluetooth™, 4G, Long Term Evolution (LTE)). The WiFi™ may be part of an IEEE 802.1 1 standard.
[0011] The term "base station" may be used subsequently to refer to any fixed transceiver apparatus that may communicate using one or more particular radio technologies. For example, base station can refer to an access point, an eNodeB, or a cell site.
[0012] User equipment (UE) may include a plurality of radios each associated with a different RAT of multiple RATs that may select various networks or be "steered" to those networks. For example, the UE RATs can employ network selection or traffic steering between different radio access networks (RAN) such as WiFi™, 3 GPP, Bluetooth™, 4G, LTE, or other wireless networks. Several solutions, based on UE-centric and network centric techniques may be used for load balancing between one network using a first radio technology (e.g., 3GPP) and second network using a second radio technology (e.g., wireless local area network (WLAN)). [0013] While the UE may be equipped with multiple radios, often it is still desirable to actively transmit on only one radio at a time due to hardware limitations, energy efficiency considerations, and/or an overall system performance perspective. It may also be desirable to move a given active session across one or more (RATs) in a seamless fashion such that minimal disruption to application performance may be observed by the user. For example, this may be true when moving a real-time application flow across RATs or when the channel or interference environment across RATs is changing dynamically. One example of moving a real-time application flow across RATs may be when the UE is using a WiFi RAT in a WiFi network for video streaming may have the flexibility to switch to LTE to receive the remainder of the video stream using an LTE RAT.
[0014] While several architectures and mobility protocols support fast session transfer, the overall user application state at the time of the session transfer is still unavailable at the new radio network at the time of the transfer. The state and metrics associated with the application may be useful for the radio network in allocating radio resources to better maintain application quality of service (QoS). For example, a proportional fair media access control (MAC) scheduler for a given RAT may rely on past throughput of the user to make its scheduling decisions across users. Unavailability of a user's past throughput knowledge may degrade user/system performance until the system achieves steady state again.
[0015] When UEs are allowed to dynamically switch between different radios, there may be a temporary performance degradation during the RAT transition. For example, cooperation between two or more radio networks may not be available because the two radios on the network side may not be collocated in the same physical devices or a backhaul interface cannot support high signaling overhead for RAT coordination.
[0016] These and other problems may be solved by the UE feeding back its application state/performance metrics to the new RAT at the time a session is transferred to the new RAT. There may be a performance improvement when such feedback is made available to the new radio network. Thus, it may be important for the UE to feedback the past user performance indicator(s) (e.g., throughput) of their past application performance to the new network controller/scheduler in order to assist the scheduler of the new RAT.
[0017] The user or application performance indicator may be fed back along with the message used to trigger the switching to the new radio network. The performance indicator may also be fed back in a separate message following the message used to trigger the switching. In such an embodiment, the delay between the session transfer and the feedback of the performance indicator should be reduced as much as possible.
[0018] The past performance indicators may be part of the metric that the scheduler uses to determine how to efficiently and fairly allocate resources to its users (e.g., UEs). Therefore, with UE feedback of such performance indicators to their new radio, the schedulers may allocate the resources based on more accurate metrics and, hence, improve the overall performance.
[0019] The UE may also feedback certain QoS metrics per application. The network can then allocate resources to maintain a desired QoS of the application without interruption.
[0020] Examples of UE/application performance metrics may include: UE time-averaged throughput for a proportional- fair scheduler, video buffer size for streaming data, and/or quality of experience (QoE) metrics. These performance metrics are for purposes of illustration only. The present embodiments are not limited to any certain performance metrics.
[0021] The UE may feedback its past time-averaged throughput measured over a certain time window (i.e., latency time scale of the scheduler) to the new RAT. A proportional- fair scheduler aims to optimize the sum log throughput of its users. The sum log throughput may be a metric that balances between total data rate and UE fairness. When performing resource allocation, a proportional- fair scheduler may compare the metric, instantaneous rate divided by smooth- throughput, and selects the UE with the highest value of the metric to be scheduled. By providing the smooth-throughput metric, the overall performance for proportional- fair schedulers may be improved and network- wide sum log throughput can be improved without disruption due to session transfer. [0022] FIG. 1 illustrates a plot of percent of users versus data rate (Mbps). The figure shows that, with feedback of the time- averaged throughput metric, the overall fairness may be improved for two different UE-centric RAT selection rules.
[0023] Other examples of throughput-based metrics may include measurements related to "on-time" throughput. On-time throughput may capture the probability of receiving a packet before its delay deadline. This metric may be useful for a scheduler that has maximized a number of UE receiving their targeted on-time throughput.
[0024] The UE may also feedback their video buffer size for streaming data. The buffer size may be fed back to the new radio if the UE is receiving streaming video from the base station. When the UE connects to only one radio, the scheduler may have a reasonable estimate of the buffer size based on acknowledgement messages from the UE. However, when the UE is switched to a different RAT, the scheduler may no longer have an estimate on the buffer size of the video. Though such information may be exchanged among the schedulers through a backbone, the UE feedback can be a more timely approach to ensure a smooth transition between RATs.
[0025] The UE may also feedback QoE metrics to the new RAT. QoE metrics include, but are not limited to, throughput, metrics indicating acceptable video viewing quality (e.g., few dropped frames, low jittering), or metrics indicating acceptable voice over internet protocol (VoIP) conversation (e.g., short packet delay, no interruption of the conversation).
[0026] FIG. 2 illustrates a signal flow diagram for a session transfer between RATs with UE feedback of performance metrics. The UE receives an indication 201 from a first base station (BS1), associated with a first RAT, that the UE should switch its session to a second base station (BS2). The UE transmits a message 203 to the second base station to trigger the switch. As part of that message or in an optional separate message 207, the UE transmits its performance metrics to the second base station. During this session switch, the UE also switches its internal radio from the RAT associated with the first base station to the RAT associated with the second base station. [0027] As an example of operation, the first base station may be a 3 GPP eNodeB and the second base station may be a WiFi access point. The UE may be running a session wherein it is streaming video from the first base station. As the UE moves away from the first base station and closer to the second base station, the first base station instructs the UE to switch. The UE determines that the second base station is the closest base station and switches its session to the second base station necessitating switching from the 3GPP RAT to the WiFi RAT.
[0028] The UE feedback of performance metrics during dynamic RAT switching may improve RAT switching in multi-RAT networks. The UE feedback indicators/metrics of application performance to overcome the lack of information exchange between schedulers of uncoordinated RATs. The performance indicators may provide useful information to the new scheduler to improve the proportional fair throughput as well as the QoE performance across applications. By aggregating the performance indicator feedback with the RAT selection decision, the information may be immediately used and performance disruption may be reduced.
[0029] FIG. 3 illustrates a diagram of an embodiment of a wireless communication system comprising the UE in a multiple base station
environment. The illustrated communication system includes a plurality of antennas 302, 303 for communicating with the UE 301.
[0030] The antennas 302, 303 may be eNodeB's and/or base stations for communicating in a cellular environment. The antennas 302, 303 may also be access points (AP) for communicating in a WiFi environment. For example, the first antenna 302 may be an eNodeB with a base station to enable the UE 301 to communicate in a 3 GPP environment while the second antenna 303 may be an access point to enable the UE 301 to communicate in a WiFi environment.
[0031] The method for UE feedback of performance metrics may be used in the communication system to enable it to seamlessly switch between the 3 GPP environment to the WiFi environment. In such a scenario, the UE 301 may be executing an application that is interfacing with the 3GPP antenna 302 by streaming video. As the UE 3012 moves away from the 3GPP antenna 302 and gets within range of the WiFi AP 303, the UE transmits its performance metrics to the WiFi AP 303 RAT prior to switching to the UE 301 switching from using its 3 GPP RAT to its WiFi RAT. This switches the UE 301 from communicating with the 3GPP eNodeB 302 to the WiFi access point 303. Such a switch may be accomplished using the signaling method illustrated in FIG. 2.
[0032] The UE 301 may thus switch from a first radio associated with a first RAT of the communication system to a second radio associated with a second RAT of the communication system. Each of the RATs may be associated with a different network or communication system. For example, the first antenna 302 may be part of a first network or communication system and the second antenna 303 may be part of a second network or communication system.
[0033] In the above embodiments, the user performance metric may be fed back to the base station/access point (BS/AP) to help in making scheduling decisions. The user performance metric can be exchanged across RATs within UEs and UEs may then feed back this information to their BS/AP through the new UE RAT. Additionally, the user performance metric can be fed back through the old RAT and exchanged between BS's/AP's over a backbone or between schedulers for different RATs if the two RATs are located in the same AP.
[0034] FIG. 4 is a block diagram illustrating a machine in the example form of user equipment 400, within which a set or sequence of instructions may be executed to cause the machine to perform any one of the methodologies discussed herein, according to an example embodiment. In alternative embodiments, the machine operates as a standalone device or may be connected (e.g., networked) to other machines. In a networked deployment, the machine may operate in the capacity of either a server or a client machine in server-client network environments, or it may act as a peer machine in peer-to-peer (or distributed) network environments. The machine may be a mobile
communication device (e.g., cellular telephone), a computer, a personal computer (PC), a tablet PC, a hybrid tablet, a personal digital assistant (PDA), or any machine capable of executing instructions (sequential or otherwise) that specify actions to be taken by that machine. Further, while only a single machine is illustrated, the term "machine" shall also be taken to include any collection of machines that individually or jointly execute a set (or multiple sets) of instructions to perform any one or more of the methodologies discussed herein. Similarly, the term "processor-based system" shall be taken to include any set of one or more machines that are controlled by or operated by a processor (e.g., a computer) to individually or jointly execute instructions to perform any one or more of the methodologies discussed herein.
[0035] Example user equipment 400 includes at least one processor 402 (e.g., a central processing unit (CPU), a graphics processing unit (GPU) or both, processor cores, compute nodes, etc.), a main memory 404 and a static memory 406, which communicate with each other via a link 408 (e.g., bus). The user equipment 400 may further include a video display unit 410 and an
alphanumeric input device 412 (e.g., a keypad). In one embodiment, the video display unit 410 and input device 412 are incorporated into a touch screen display. The user equipment 400 may additionally include a storage device 416 (e.g., a drive unit), a signal generation device 418 (e.g., a speaker), a network interface device 420, and one or more sensors (not shown).
[0036] The storage device 416 includes a machine-readable medium 422 on which is stored one or more sets of data structures and instructions 424 (e.g., software) embodying or utilized by any one or more of the methodologies or functions described herein. The instructions 424 may also reside, completely or at least partially, within the main memory 404, static memory 406, and/or within the processor 402 during execution thereof by the user equipment 400, with the main memory 404, static memory 406, and the processor 402 also constituting machine-readable media.
[0037] While the machine-readable medium 422 is illustrated in an example embodiment to be a single medium, the term "machine-readable medium" may include a single medium or multiple media (e.g., a centralized or distributed database, and/or associated caches and servers) that store the one or more instructions 424. The term "machine-readable medium" shall also be taken to include any tangible medium that is capable of storing, encoding or carrying instructions for execution by the machine and that cause the machine to perform any one or more of the methodologies of the present disclosure or that is capable of storing, encoding or carrying data structures utilized by or associated with such instructions. The term "machine-readable medium" shall accordingly be taken to include, but not be limited to, solid-state memories, and optical and magnetic media. Specific examples of machine-readable media include nonvolatile memory, including but not limited to, by way of example,
semiconductor memory devices (e.g., electrically programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM)) and flash memory devices; magnetic disks such as internal hard disks and removable disks; magneto-optical disks; and CD-ROM and DVD- ROM disks.
[0038] The instructions 424 may further be transmitted or received over a communications network 426 using a transmission medium via the network interface device 420 utilizing any one of a number of well-known transfer protocols (e.g., HTTP). Examples of communication networks include a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN) the Internet, mobile telephone networks, plain old telephone (POTS) networks, and wireless data networks (e.g., WI-FI™ (IEEE 802.1 1), 3 GPP, 4G LTE/LTE-A or WiMAX networks). The term "transmission medium" shall be taken to include any intangible medium that is capable of storing, encoding, or carrying instructions for execution by the machine, and includes digital or analog communications signals or other intangible medium to facilitate communication of such software. The network interface device may include one or more antennas for communicating with the wireless network.

Claims

CLAIMS What is claimed is:
1. A method for dynamic radio switching with user equipment (UE)
feedback of performance metrics, the UE having a plurality of radios, the method comprising:
the UE receiving an indication to switch from a first radio associated with a first radio access technology (RAT) of a communication system to a second radio associated with a second RAT of the communication system;
the UE transmitting the performance metrics to the second radio; and the UE switching from a first radio of the plurality of radios to a second radio of the plurality of radios, the first radio associated with the first RAT and the second radio associated with the second RAT.
2. The method of claim 1 wherein the UE transmitting the performance metrics to at least one of the base station or the access point associated with the second communication technology comprises the UE transmitting one or more of throughput, UE time-averaged throughput for a proportional- fair scheduler, video buffer size for streaming data, and/or quality of experience (QoE) metrics.
3. The method of claim 2 wherein the QoE metrics comprise throughput, metrics indicating acceptable video viewing quality (e.g., few dropped frames, low jittering), or metrics indicating acceptable voice over internet protocol (VoIP) conversation (e.g., short packet delay, no interruption of the conversation).
4. The method of claim 1 wherein the UE transmitting the performance metrics to at least one of the base station or the access point associated with the second communication technology comprises the UE transmitting the performance metrics to a first radio associated with the first RAT.
5. The method of claim 1 wherein the performance metrics comprise past application performance of an application being executed by the UE.
6. The method of claim 1 wherein the UE transmitting the performance metrics to the second radio comprises the UE transmitting the performance metrics with the indication used to trigger the switch from the first radio to the second radio.
7. The method of claim 1 wherein the UE transmitting the performance metrics to the second radio comprises the UE transmitting the performance metrics during session transfer.
8. The method of claim 1 wherein the performance metrics are part of a metric used by a scheduler of the communication system to determine how to allocate resources to different UEs.
9. User equipment (UE) for operating in a plurality of wireless networks, the user equipment comprising:
a network interface device to communicate with a plurality of base
stations each having an antenna, the network interface device to receive a transfer session indication from a first base station of the plurality of base stations wherein the first base station communicates with a radio associated with a first radio access technology and the second base station communicates with a radio associated with a second radio access technology;
a plurality of radios, each radio to operate on a different radio access technology; and
a processor coupled to the network interface and the plurality of radios to control operation of the user equipment and dynamically switch from a first radio of the plurality of radios to a second radio of the plurality of radios, the operation including determining UE performance metrics that are transmitted to a second base station of the plurality of base stations.
10. The user equipment of claim 9 wherein the plurality of radios each
operate on one of IEEE 802.1 1, 3 GPP, 4G LTE/LTE-A or WiMAX network radio access technology.
PCT/US2014/035409 2013-04-26 2014-04-25 User equipment and method for feedback of user equipment performance metrics during dynamic radio switching WO2014176480A1 (en)

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CN201480017237.9A CN105052202B (en) 2013-04-26 2014-04-25 User equipment and method during dynamic radio switching for feedback user equipment performance measurement
HK16105109.9A HK1217145A1 (en) 2013-04-26 2016-05-04 User equipment and method for feedback of user equipment performance metrics during dynamic radio switching

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US14/107,400 US9392539B2 (en) 2013-04-26 2013-12-16 User equipment and method for feedback of user equipment performance metrics during dynamic radio switching
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PCT/US2013/062455 WO2014175919A1 (en) 2013-04-26 2013-09-27 Shared spectrum reassignment in a spectrum sharing context
PCT/US2013/074692 WO2014175923A1 (en) 2013-04-26 2013-12-12 Hybrid reference signals for wireless communication
PCT/US2014/023022 WO2014175967A1 (en) 2013-04-26 2014-03-11 Wireless local area network (wlan) selection rules
PCT/US2014/023744 WO2014175968A1 (en) 2013-04-26 2014-03-11 Uplink enhancements for efficient operation in small cell environments
PCT/US2014/032032 WO2014175990A1 (en) 2013-04-26 2014-03-27 Systems, methods, and devices for distributed scheduling for device-to-device interference mitigation
PCT/US2014/032268 WO2014175999A1 (en) 2013-04-26 2014-03-28 Diameter/xml protocol conversion
PCT/US2014/032227 WO2014175997A1 (en) 2013-04-26 2014-03-28 Systems and methods using a centralized node to collect ran user plane congestion information
PCT/US2014/033965 WO2014176058A1 (en) 2013-04-26 2014-04-14 User equipment and methods for adapting system parameters based on extended paging cycles
PCT/US2014/034307 WO2014176087A1 (en) 2013-04-26 2014-04-16 Interactive zooming in video conferencing
PCT/US2014/034337 WO2014176089A1 (en) 2013-04-26 2014-04-16 Architecture for web-based real-time communications (webrtc) to access internet protocol multimedia subsystem (ims)
PCT/US2014/034480 WO2014176106A1 (en) 2013-04-26 2014-04-17 Radio access technology information storage in a mobile network
PCT/US2014/034966 WO2014176245A1 (en) 2013-04-26 2014-04-22 System and method for interference cancellation and/or supression on physical downlink shared channel at the user equipment
PCT/US2014/034879 WO2014176200A1 (en) 2013-04-26 2014-04-22 An apparatus and method for congestion control in wireless communication networks
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PCT/US2014/023022 WO2014175967A1 (en) 2013-04-26 2014-03-11 Wireless local area network (wlan) selection rules
PCT/US2014/023744 WO2014175968A1 (en) 2013-04-26 2014-03-11 Uplink enhancements for efficient operation in small cell environments
PCT/US2014/032032 WO2014175990A1 (en) 2013-04-26 2014-03-27 Systems, methods, and devices for distributed scheduling for device-to-device interference mitigation
PCT/US2014/032268 WO2014175999A1 (en) 2013-04-26 2014-03-28 Diameter/xml protocol conversion
PCT/US2014/032227 WO2014175997A1 (en) 2013-04-26 2014-03-28 Systems and methods using a centralized node to collect ran user plane congestion information
PCT/US2014/033965 WO2014176058A1 (en) 2013-04-26 2014-04-14 User equipment and methods for adapting system parameters based on extended paging cycles
PCT/US2014/034307 WO2014176087A1 (en) 2013-04-26 2014-04-16 Interactive zooming in video conferencing
PCT/US2014/034337 WO2014176089A1 (en) 2013-04-26 2014-04-16 Architecture for web-based real-time communications (webrtc) to access internet protocol multimedia subsystem (ims)
PCT/US2014/034480 WO2014176106A1 (en) 2013-04-26 2014-04-17 Radio access technology information storage in a mobile network
PCT/US2014/034966 WO2014176245A1 (en) 2013-04-26 2014-04-22 System and method for interference cancellation and/or supression on physical downlink shared channel at the user equipment
PCT/US2014/034879 WO2014176200A1 (en) 2013-04-26 2014-04-22 An apparatus and method for congestion control in wireless communication networks

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